Central air conditioning system integrated with phase change energy storage device

Abstract

The utility model belongs to the technical field of refrigeration, and discloses a central air-conditioning system integrated with a phase change energy storage device, which comprises an air-conditioning refrigeration host, the phase change energy storage device and an outdoor cold exchange device, the air-conditioning refrigeration host is communicated with a cold using terminal to form a first cold supply loop, and the phase change energy storage device is communicated with the cold using terminal to form a second cold supply loop. The first cold supply loop and the second cold supply loop are both used for cooling the cold using terminal; the outdoor cold exchange device communicates with the phase change energy storage device to form a first cold storage loop, the air conditioner refrigeration host communicates with the phase change energy storage device to form a second cold storage loop, and the first cold storage loop and the second cold storage loop are both used for storing cold energy into a phase change material in the phase change energy storage device. According to the utility model, the installed capacity of the air conditioner refrigeration host is smaller and the influence on the power grid is smaller on the basis of meeting the cold use requirement of an installation place.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, and in particular to a central air conditioning system with an integrated phase change energy storage device. Background Technology

[0002] Central air conditioning systems are used in buildings such as hospitals, hotels, office buildings, airports, and train stations, and typically consist of one or more cold / heat source systems and multiple air conditioning systems. Among these, the refrigeration system within the cold / heat source system is the most crucial component of a central air conditioning system. Its type, operating mode, and structural form directly affect the economy, efficiency, and rationality of the central air conditioning system during operation. Central air conditioning systems usually require large-capacity refrigeration units to meet the most unfavorable cooling requirements of the building.

[0003] In existing technologies, to meet the rapid cooling needs of places like office buildings, hospitals, and stadiums, the installed capacity of the central air conditioning system is typically designed based on the maximum load of the installation site. Large-capacity central air conditioning systems often require more raw materials and manufacturing processes, while smaller, more energy-efficient systems can utilize resources more effectively, achieving cost savings throughout their lifecycle and significantly reducing initial investment costs. Furthermore, large-capacity central air conditioning systems consume enormous amounts of electricity during high-load operation, and the peak electricity consumption periods in cities often coincide with these peak times, exacerbating the imbalance between peak and off-peak power supply and leading to power shortages during peak periods.

[0004] Therefore, there is an urgent need for a central air conditioning system that can meet the cooling needs of the installation site, has a small installed capacity, and has a minimal impact on the power grid. Utility Model Content

[0005] The purpose of this invention is to provide a central air conditioning system with an integrated phase change energy storage device, which can meet the cooling needs of the installation site while having a small installed capacity of the air conditioning unit and a small impact on the power grid.

[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0007] A central air conditioning system integrating a phase change energy storage device is provided, including an air conditioning chiller, a phase change energy storage device, and an outdoor cooling exchange device; the air conditioning chiller is connected to a cooling terminal to form a first cooling circuit, and the phase change energy storage device is connected to the cooling terminal to form a second cooling circuit, wherein both the first cooling circuit and the second cooling circuit are used for cooling the cooling terminal.

[0008] The outdoor cooling exchange device and the phase change energy storage device are connected to form a first cold storage circuit, and the air conditioning refrigeration unit is connected to the phase change energy storage device to form a second cold storage circuit. Both the first cold storage circuit and the second cold storage circuit are used to store cold energy into the phase change material in the phase change energy storage device.

[0009] Optionally, the first cooling circuit, the second cooling circuit, the first cold storage circuit, and the second cold storage circuit are independent of each other.

[0010] Optionally, the central air conditioning system integrating phase change energy storage device includes a first pipe, a second pipe, a third pipe, a fourth pipe, a fifth pipe, a sixth pipe, a first tee connector, and a second tee connector;

[0011] One end of the first pipeline is connected to the outlet of the phase change energy storage device, and the other end is connected to the first port of the first tee connector; one end of the second pipeline is connected to the first inlet and outlet of the air conditioning refrigeration unit, and the other end is connected to the second port of the first tee connector; one end of the third pipeline is connected to the third port of the first tee connector, and the other end is connected to the inlet of the cooling terminal.

[0012] One end of the fourth pipeline is connected to the inlet of the phase change energy storage device, and the other end is connected to the first port of the second three-way connector; one end of the fifth pipeline is connected to the second inlet and outlet of the air conditioning refrigeration unit, and the other end is connected to the second port of the second three-way connector; one end of the sixth pipeline is connected to the third port of the second three-way connector, and the other end is connected to the outlet of the cooling terminal.

[0013] Optionally, the air conditioning refrigeration unit, the second pipe, the first tee connector, the third pipe, the cooling terminal, the sixth pipe, the second tee connector, and the fifth pipe form the first cooling circuit;

[0014] The phase change energy storage device, the first pipeline, the first tee connector, the third pipeline, the cooling terminal, the sixth pipeline, the second tee connector, and the fourth pipeline are connected in sequence to form the second cooling circuit;

[0015] Optionally, the phase change energy storage device, the first pipeline, the first tee connector, the second pipeline, the air conditioning refrigeration unit, the fifth pipeline, the second tee connector, and the third pipeline are sequentially connected to form the second cold storage circuit.

[0016] Optionally, the sixth pipeline is equipped with a check valve, which is used to prevent the refrigerant carrier in the sixth pipeline from flowing back to the outlet of the cooling terminal.

[0017] Optionally, the first pipeline, the second pipeline, and the third pipeline are all equipped with flow control components and drive components;

[0018] The driving component on the first pipeline is used to drive the refrigerant carrier in the second cooling circuit and the second cold storage circuit to move; the driving component on the second pipeline is used to drive the refrigerant carrier in the first cooling circuit to move; the driving component on the third pipeline is used to drive the refrigerant carrier in the first cooling circuit and / or the second cooling circuit to move.

[0019] Optionally, the central air conditioning system integrating the phase change energy storage device includes a seventh pipe and an eighth pipe. The outdoor cooling exchange device, the seventh pipe, the phase change energy storage device, and the eighth pipe form the first cold storage circuit. A refrigerant carrier is provided in each of the first cold storage circuits. The refrigerant carrier in the first cold storage circuit is used to exchange heat with the phase change material in the phase change energy storage device.

[0020] Optionally, the seventh pipeline is equipped with a second flow control valve and a second drive pump, the second drive pump being used to drive the refrigerant carrier in the first cold storage circuit to move.

[0021] The beneficial effects of this utility model are:

[0022] The central air conditioning system with integrated phase change energy storage device provided by this utility model has two methods of cold storage. One method is that during the low-load demand period of the cooling terminal at night or during the period when the outdoor temperature is high at night (the outdoor temperature cannot meet the phase change cold storage temperature requirement), the air conditioning refrigeration unit works and stores the cold energy in the phase change material of the phase change energy storage device. Since the night is the off-peak period for electricity prices, the phase change energy storage device can make full use of the low electricity price period at night for cold storage. By utilizing the characteristics of "time-of-use pricing", it can achieve the effect of "peak shaving and valley filling" on the one hand, and on the other hand, it can have a lower cost, so as to save the power consumption of the air conditioning refrigeration unit during the peak electricity consumption period, thereby saving the system operating cost. The other method is that during the period when the outdoor temperature meets the phase change cold storage temperature requirement at night (i.e., the outdoor temperature is low at night), the cold energy is stored in the phase change material of the phase change energy storage device through an outdoor cooling exchange device. During periods of low cooling load, cooling can be provided solely through the phase change energy storage device. During periods of high cooling load, both the phase change energy storage device and the air conditioning chiller work together to provide cooling for the user terminals. Even with a smaller installed capacity air conditioning chiller, high-load cooling demand can be met, significantly reducing equipment investment and lowering cooling costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is a first schematic diagram of a central air conditioning system with an integrated phase change energy storage device provided in this embodiment of the present invention;

[0025] Figure 2 This is a second schematic diagram of a central air conditioning system with an integrated phase change energy storage device provided in this embodiment of the present invention;

[0026] Figure 3 This is a third schematic diagram of a central air conditioning system with an integrated phase change energy storage device provided in this embodiment of the present invention;

[0027] Figure 4 This is a fourth schematic diagram of a central air conditioning system with an integrated phase change energy storage device provided in this embodiment of the present invention;

[0028] Figure 5 This is the fifth schematic diagram of a central air conditioning system with an integrated phase change energy storage device provided in this embodiment of the utility model;

[0029] Figure 6 This is the sixth schematic diagram of a central air conditioning system with an integrated phase change energy storage device provided in this embodiment of the present invention.

[0030] In the picture:

[0031] 100. Air conditioning refrigeration unit; 200. Phase change energy storage device; 300. Outdoor cooling exchange device; 400. Cooling terminal; 500. First flow control valve; 600. First drive pump; 700. Second flow control valve; 800. Second drive pump; 1. Third flow control valve; 2. Third drive pump; 3. Fourth flow control valve; 4. Fourth drive pump;

[0032] 10. First pipeline; 20. Second pipeline; 30. Third pipeline; 40. Fourth pipeline; 50. Fifth pipeline; 60. Sixth pipeline; 70. First tee connector; 80. Second tee connector; 90. Seventh pipeline; 1a. Eighth pipeline; 1b. Check valve. Detailed Implementation

[0033] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0038] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.

[0039] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] This embodiment provides a central air conditioning system with an integrated phase change energy storage device, which can meet the cooling needs of the installation site while having a small installed capacity of the air conditioning chiller and minimal impact on the power grid.

[0041] like Figures 1 to 6 As shown, the central air conditioning system integrating a phase change energy storage device includes an air conditioning chiller 100, a phase change energy storage device 200, and an outdoor cooling exchange device 300. The air conditioning chiller 100 is connected to a cooling terminal 400 to form a first cooling circuit, and the phase change energy storage device 200 is connected to the cooling terminal 400 to form a second cooling circuit. Both the first and second cooling circuits are used to cool the cooling terminal 400. For example, the refrigerant in both circuits can be supplied to the cooling terminal 400 to cool it.

[0042] In this embodiment, the outdoor cooling exchange device 300 and the phase change energy storage device 200 are connected to form a first cold storage circuit, and the air conditioning refrigeration unit 100 is connected to the phase change energy storage device 200 to form a second cold storage circuit. Both the first and second cold storage circuits are used to store cold energy into the phase change material in the phase change energy storage device 200, that is, to store cold energy in the phase change material of the phase change energy storage device 200. When needed, the phase change material in the phase change energy storage device 200 can release cold energy to the refrigerant carrier in the second cooling circuit, and then transport the cold energy to the cooling terminal 400 through the second cooling circuit for cooling.

[0043] Phase change material (PCM) refers to a substance that changes its state of matter while maintaining a constant temperature and can provide latent heat. The process of changing physical properties is called a phase change process, during which the PCM absorbs or releases a large amount of latent heat. The phase change temperature of the PCM is related to the specific parameters of the refrigeration unit (not the PCM itself), and this embodiment does not impose any limitations on this.

[0044] The central air conditioning system with integrated phase change energy storage device provided in this embodiment has two methods of cold storage. One method is that during the low-load demand period of the cooling terminal at night or during the period when the outdoor temperature is high at night (the outdoor temperature cannot meet the phase change cold storage temperature requirement), the air conditioning chiller works and stores the cold energy in the phase change material of the phase change energy storage device. Since the night is the off-peak period for electricity prices, the phase change energy storage device can make full use of the low electricity price period at night for cold storage. By utilizing the characteristics of "time-of-use pricing", it can achieve the effect of "peak shaving and valley filling" on the one hand, and on the other hand, it can have a lower cost, so as to save the power consumption of the air conditioning chiller during the peak electricity consumption period, thereby saving the system operating cost. The other method is that during the period when the outdoor temperature meets the phase change cold storage temperature requirement at night (i.e., the outdoor temperature is low at night), the cold energy is stored in the phase change material of the phase change energy storage device through the outdoor cooling exchange device. During periods of low cooling load, cooling can be provided solely through the phase change energy storage device. During periods of high cooling load, both the phase change energy storage device and the air conditioning chiller work together to provide cooling for the user terminals. Even with a smaller installed capacity air conditioning chiller, high-load cooling demand can be met, significantly reducing equipment investment and lowering cooling costs.

[0045] For example, the phase change energy storage device 200 may include a shell, in which the phase change material is filled and exchanges heat with the refrigerant carrier through an internal heat exchange structure. This embodiment does not limit the type or specific structure of the internal heat exchange structure.

[0046] In some alternative embodiments, the first cooling circuit, the second cooling circuit, the first cold storage circuit, and the second cold storage circuit are independent of each other; that is, each circuit is connected by a separate pipeline to reduce the mutual influence between different circuits.

[0047] In some other alternative embodiments, such as Figures 1 to 6 As shown, the first cooling circuit and the second cooling circuit partially overlap, that is, the phase change energy storage device 200 and the air conditioning chiller 100 are connected in parallel. For example, the phase change energy storage device 200 can be connected to the existing central air conditioning system to achieve parallel connection with the air conditioning chiller 100.

[0048] Specifically, such as Figure 1 As shown, the central air conditioning system with integrated phase change energy storage device includes a first pipe 10, a second pipe 20, a third pipe 30, a fourth pipe 40, a fifth pipe 50, a sixth pipe 60, a first tee connector 70, and a second tee connector 80.

[0049] The first pipe 10 is connected at one end to the outlet of the phase change energy storage device 200 and at the other end to the first port of the first tee connector 70. The second pipe 20 is connected at one end to the first inlet / outlet of the air conditioning unit 100 and at the other end to the second port of the first tee connector 70. The third pipe 30 is connected at one end to the third port of the first tee connector 70 and at the other end to the inlet of the cooling terminal 400. The fourth pipe 40 is connected at one end to the inlet of the phase change energy storage device 200 and at the other end to the first port of the second tee connector 80. The fifth pipe 50 is connected at one end to the second inlet / outlet of the air conditioning unit 100 and at the other end to the second port of the second tee connector 80. The sixth pipe 60 is connected at one end to the third port of the second tee connector 80 and at the other end to the outlet of the cooling terminal 400. The first inlet / outlet of the air conditioning unit 100 can be used as both an outlet and an inlet; similarly, the second inlet / outlet of the air conditioning unit 100 can be used as both an outlet and an inlet.

[0050] For example, the air conditioning refrigeration unit 100, the second pipe 20, the first tee connector 70, the third pipe 30, the cooling terminal 400, the sixth pipe 60, the second tee connector 80, and the fifth pipe 50 form a first cooling circuit. The phase change energy storage device 200, the first pipe 10, the first tee connector 70, the third pipe 30, the cooling terminal 400, the sixth pipe 60, the second tee connector 80, and the fourth pipe 40 form a second cooling circuit. The phase change energy storage device 200, the first pipe 10, the first tee connector 70, the second pipe 20, the air conditioning refrigeration unit 100, the fifth pipe 50, the second tee connector 80, and the third pipe 30 form a second cold storage circuit. It should be noted that when the air conditioning refrigeration unit 100 is used for cooling the cooling terminal 400, the first inlet and outlet are used as outlets, and the second inlet and outlet are used as inlets. When the air conditioning unit 100 is used to store cooling capacity in the phase change energy storage device 200, the first inlet and outlet are used as inlets. The refrigerant carrier flowing out of the phase change energy storage device 200 can enter the air conditioning unit 100 through the first inlet and outlet. After the temperature drops, it flows out through the second inlet and outlet of the air conditioning unit 100 and returns to the phase change energy storage device 200, storing the cooling capacity in the phase change material of the phase change energy storage device 200.

[0051] To prevent the refrigerant flowing from the second inlet and outlet of the air conditioning unit 100 from flowing through the sixth pipe 60 to the outlet of the cooling terminal 400, optionally, as follows: Figure 2 As shown, the sixth pipe 60 is equipped with a check valve 1b, which can also be called a one-way valve. The check valve 1b is used to prevent the refrigerant in the sixth pipe 60 from flowing back to the outlet of the cooling terminal 400. This ensures the normal operation of the second cold storage circuit.

[0052] In some alternative embodiments, such as Figure 1 As shown, the first pipe 10, the second pipe 20, and the third pipe 30 are all equipped with flow control components and drive components. The drive component on the first pipe 10 is used to drive the movement of the refrigerant carrier in the second cooling circuit and the second cold storage circuit. The drive component on the second pipe 20 is used to drive the movement of the refrigerant carrier in the first cooling circuit. The drive component on the third pipe 30 is used to drive the movement of the refrigerant carrier in the first cooling circuit and / or the second cooling circuit. The flow control component is used to regulate the flow rate of its respective pipe. The flow control component can be a structure found in the prior art, and this embodiment is not limited to it. The drive component can be a pump found in the prior art, and this embodiment is not limited to it.

[0053] For example, such as Figure 5 and Figure 6 As shown, the flow control device on the first pipeline 10 is the first flow control valve 500, and the driving device on the first pipeline 10 is the first driving pump 600; the flow control device on the second pipeline 20 is the third flow control valve 1, and the driving device on the second pipeline 20 is the third driving pump 2; the flow control device on the third pipeline 30 is the fourth flow control valve 3, and the driving device on the third pipeline 30 is the fourth driving pump 4.

[0054] Optionally, please continue to see Figure 1 The central air conditioning system integrating phase change energy storage device includes a seventh pipe 90 and an eighth pipe 1a. Among them, the outdoor cooling exchange device 300, the seventh pipe 90, the phase change energy storage device 200 and the eighth pipe 1a are connected in sequence to form the first cold storage circuit.

[0055] In some optional embodiments, the seventh pipeline 90 is equipped with a second flow control valve 700 and a second drive pump 800. The second drive pump 800 drives the refrigerant carrier in the first cold storage circuit. The second flow control valve 700 regulates the flow rate of the fluid in the seventh pipeline 90. A refrigerant carrier is provided in each of the first cold storage circuits. The refrigerant carrier in the first cold storage circuit is used to exchange heat with the phase change material in the phase change energy storage device 200, thereby storing cold for the phase change material in the phase change energy storage device 200. Exemplarily, the refrigerant carrier includes ethylene glycol; specifically, the refrigerant carrier can be an ethylene glycol solution. It is understood that the refrigerant carrier can also be other substances, and this embodiment does not limit this.

[0056] Optionally, in this embodiment, the phase change energy storage device 200 performs cold storage from 0:00 to 8:00 AM, and the cold storage capacity reaches a preset value. From 8:00 AM to 10:00 PM, the air conditioning cooling unit 100 and the phase change energy storage device 200 simultaneously provide cooling capacity.

[0057] The central air conditioning system with integrated phase change energy storage device provided in this embodiment has multiple operating conditions, which will be described in detail below.

[0058] Cold storage mode 1: When the outdoor temperature is low at night, the second flow control valve 700 opens, the second drive pump 800 starts, and the first flow control valve 500, the first drive pump 600, the third flow control valve 1, the third drive pump 2, the fourth flow control valve 3, and the fourth drive pump 4 are all closed. Through heat exchange between the refrigerant carrier in the outdoor cooling exchange device 300 and the phase change material in the phase change energy storage device 200, cold energy can be stored in the phase change material, reducing the utilization rate of the air conditioning refrigeration unit 100 during the nighttime cold storage period.

[0059] Cold storage mode 2: When the outdoor temperature is high at night and it is impossible to use the low outdoor temperature at night to store cold for the phase change material in the phase change energy storage device 200, the first flow control valve 500, the first drive pump 600, the third flow control valve 1 and the third drive pump 2 are all started, and the fourth flow control valve 3, the fourth drive pump 4, the second flow control valve 700 and the second drive pump 800 are all closed. At this time, the air conditioning refrigeration unit 100 stores cold for the phase change material in the phase change energy storage device 200 during the off-peak electricity period at night. Figure 5 This is a schematic diagram showing the flow of the refrigerant in the second cold storage circuit under this operating condition.

[0060] High cooling load cooling condition: During high load periods, the phase change material in the phase change energy storage device 200 and the air conditioning refrigeration unit 100 work together to supply cooling to the cooling terminal 400. At this time, the first flow control valve 500, the first drive pump 600, the third flow control valve 1, the third drive pump 2, the fourth flow control valve 3 and the fourth drive pump 4 are all open, while the second flow control valve 700 and the second drive pump 800 are closed. Figure 4 This is a schematic diagram of the refrigerant flow under this operating condition.

[0061] Non-high cooling load cooling release conditions: During non-high load periods, such as... Figure 2 As shown, the phase change energy storage device 200 is cooled independently. The first flow control valve 500, the first drive pump 600, the fourth flow control valve 3, and the fourth drive pump 4 are all open, while the third flow control valve 1, the third drive pump 2, the second flow control valve 700, and the second drive pump 800 are closed. Figure 2 This is a schematic diagram showing the flow of the refrigerant in the second cooling circuit under this operating condition.

[0062] The central air conditioning system with integrated phase change energy storage device provided in this embodiment has the following advantages:

[0063] 1. Due to the low ambient temperature at night, the phase change energy storage device 200 stores cold air in advance, which can reduce the overall power of the central air conditioning system with integrated phase change energy storage, improve the energy efficiency ratio, significantly reduce energy consumption, and reduce environmental impact. At the same time, it can also utilize the low temperature cooling capacity at night to reduce the utilization rate of the air conditioning refrigeration unit 100.

[0064] 2. A central air conditioning system with integrated phase change energy storage can store cooling capacity during off-peak hours at night and release energy during peak hours during the day to provide a cooling source for the 400 cooling terminals, which can reduce the overall operating cost of the central air conditioning system with integrated phase change energy storage.

[0065] 3. During off-peak cooling periods, adding a phase change energy storage device 200 can stabilize the operating load of the air conditioning chiller 100, improve the working efficiency of the central air conditioning system with integrated phase change energy storage device, and extend the service life of the central air conditioning system with integrated phase change energy storage device.

[0066] 4. The central air conditioning system with integrated phase change energy storage device provided in this embodiment also helps to shift peak power and fill valleys, alleviate the contradiction between energy supply and demand, relieve the power supply tension during high load periods of power plants, and ensure the safety of the power grid.

[0067] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A central air conditioning system integrating a phase change energy storage device, characterized in that, It includes an air conditioning refrigeration unit (100), a phase change energy storage device (200), and an outdoor cooling exchange device (300); the air conditioning refrigeration unit (100) is connected to a cooling terminal (400) to form a first cooling circuit, and the phase change energy storage device (200) is connected to the cooling terminal (400) to form a second cooling circuit. Both the first cooling circuit and the second cooling circuit are used for cooling the cooling terminal (400). The outdoor cooling exchange device (300) and the phase change energy storage device (200) are connected to form a first cold storage circuit, and the air conditioning refrigeration unit (100) is connected to the phase change energy storage device (200) to form a second cold storage circuit. Both the first cold storage circuit and the second cold storage circuit are used to store cold energy into the phase change material in the phase change energy storage device (200).

2. The central air conditioning system with integrated phase change energy storage device according to claim 1, characterized in that, The first cooling circuit, the second cooling circuit, the first cold storage circuit, and the second cold storage circuit are independent of each other.

3. The central air conditioning system with integrated phase change energy storage device according to claim 1, characterized in that, The central air conditioning system with integrated phase change energy storage device includes a first pipe (10), a second pipe (20), a third pipe (30), a fourth pipe (40), a fifth pipe (50), a sixth pipe (60), a first tee connector (70), and a second tee connector (80); One end of the first pipeline (10) is connected to the outlet of the phase change energy storage device (200), and the other end is connected to the first port of the first tee connector (70); One end of the second pipe (20) is connected to the first inlet and outlet of the air conditioning refrigeration unit (100), and the other end is connected to the second port of the first tee connector (70); one end of the third pipe (30) is connected to the third port of the first tee connector (70), and the other end is connected to the inlet of the cooling terminal (400); One end of the fourth pipe (40) is connected to the inlet of the phase change energy storage device (200), and the other end is connected to the first port of the second three-way connector (80); one end of the fifth pipe (50) is connected to the second inlet and outlet of the air conditioning refrigeration unit (100), and the other end is connected to the second port of the second three-way connector (80); one end of the sixth pipe (60) is connected to the third port of the second three-way connector (80), and the other end is connected to the outlet of the cooling terminal (400).

4. The central air conditioning system with integrated phase change energy storage device according to claim 3, characterized in that, The air conditioning refrigeration unit (100), the second pipe (20), the first tee connector (70), the third pipe (30), the cooling terminal (400), the sixth pipe (60), the second tee connector (80), and the fifth pipe (50) form the first cooling circuit; The phase change energy storage device (200), the first pipeline (10), the first tee connector (70), the third pipeline (30), the cooling terminal (400), the sixth pipeline (60), the second tee connector (80), and the fourth pipeline (40) are connected in sequence to form the second cooling circuit.

5. The central air conditioning system with integrated phase change energy storage device according to claim 4, characterized in that, The phase change energy storage device (200), the first pipeline (10), the first tee connector (70), the second pipeline (20), the air conditioning refrigeration unit (100), the fifth pipeline (50), the second tee connector (80), and the third pipeline (30) are connected in sequence to form the second cold storage circuit.

6. The central air conditioning system with integrated phase change energy storage device according to claim 5, characterized in that, The sixth pipeline (60) is equipped with a check valve (1b), which is used to prevent the refrigerant carrier in the sixth pipeline (60) from flowing back to the outlet of the cooling terminal (400).

7. The central air conditioning system with integrated phase change energy storage device according to claim 4, characterized in that, The first pipeline (10), the second pipeline (20) and the third pipeline (30) are all equipped with flow control components and drive components; The driving element on the first pipeline (10) is used to drive the movement of the refrigerant carrier in the second cooling circuit and the second cold storage circuit; The driving element on the second pipeline (20) is used to drive the refrigerant carrier in the first cooling circuit to move; the driving element on the third pipeline (30) is used to drive the refrigerant carrier in the first cooling circuit and / or the second cooling circuit to move.

8. The central air conditioning system with an integrated phase change energy storage device according to any one of claims 3-7, characterized in that, The central air conditioning system with integrated phase change energy storage device includes a seventh pipe (90) and an eighth pipe (1a). The outdoor cooling exchange device (300), the seventh pipe (90), the phase change energy storage device (200) and the eighth pipe (1a) form the first cold storage circuit. A refrigerant carrier is provided in the first cold storage circuit. The refrigerant carrier in the first cold storage circuit is used to exchange heat with the phase change material in the phase change energy storage device (200).

9. The central air conditioning system with integrated phase change energy storage device according to claim 8, characterized in that, The seventh pipeline (90) is equipped with a second flow control valve (700) and a second drive pump (800), the second drive pump (800) being used to drive the refrigerant carrier in the first cold storage circuit to move.

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